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/*===================================================================*/
/* */
/* Mapper 201 (21-in-1) */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 201 */
/*-------------------------------------------------------------------*/
void Map201_Init()
{
/* Initialize Mapper */
MapperInit = Map201_Init;
/* Write to Mapper */
MapperWrite = Map201_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map0_Apu;
/* Read from APU */
MapperReadApu = Map0_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map0_HSync;
/* Callback at PPU */
MapperPPU = Map0_PPU;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set SRAM Banks */
SRAMBANK = SRAM;
/* Set ROM Banks */
ROMBANK0 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMPAGE( 0 );
ROMBANK3 = ROMPAGE( 1 );
/* Set PPU Banks */
if ( NesHeader.byVRomSize > 0 ) {
for ( int nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 201 Write Function */
/*-------------------------------------------------------------------*/
void Map201_Write( WORD wAddr, BYTE byData )
{
BYTE byBank = (BYTE)wAddr & 0x03;
if (!(wAddr&0x08) )
byBank = 0;
/* Set ROM Banks */
ROMBANK0 = ROMPAGE(((byBank<<2)+0) % (NesHeader.byRomSize<<1));
ROMBANK1 = ROMPAGE(((byBank<<2)+1) % (NesHeader.byRomSize<<1));
ROMBANK2 = ROMPAGE(((byBank<<2)+2) % (NesHeader.byRomSize<<1));
ROMBANK3 = ROMPAGE(((byBank<<2)+3) % (NesHeader.byRomSize<<1));
/* Set PPU Banks */
PPUBANK[0] = VROMPAGE(((byBank<<3)+0) % (NesHeader.byVRomSize<<3));
PPUBANK[1] = VROMPAGE(((byBank<<3)+1) % (NesHeader.byVRomSize<<3));
PPUBANK[2] = VROMPAGE(((byBank<<3)+2) % (NesHeader.byVRomSize<<3));
PPUBANK[3] = VROMPAGE(((byBank<<3)+3) % (NesHeader.byVRomSize<<3));
PPUBANK[4] = VROMPAGE(((byBank<<3)+4) % (NesHeader.byVRomSize<<3));
PPUBANK[5] = VROMPAGE(((byBank<<3)+5) % (NesHeader.byVRomSize<<3));
PPUBANK[6] = VROMPAGE(((byBank<<3)+6) % (NesHeader.byVRomSize<<3));
PPUBANK[7] = VROMPAGE(((byBank<<3)+7) % (NesHeader.byVRomSize<<3));
InfoNES_SetupChr();
}
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